Cap opening aid



FIG. 1 is a perspective view of the cap opening aid from above;

FIG. 2 is a side elevational view thereof, the side opposite being a mirror image;

FIG. 3 is an end elevational view thereof the side opposite being identical;

FIG. 4 is a top plan view thereof, the bottom plan view being a mirror image. 

The ornamental design for a cap opening aid, as shown and described. 